Wideband-CDMA or W-CDMA is a term used to denote the UMTS radio-interface for the paired bands, UMTS FDD. W-CDMA can be deployed in a number of bands (see UMTS Bands). The core bands for deployment of UMTS FDD Wideband-CDMA are 1920-1980 MHz paired with 2110-2170 MHz. W-CDMA is officially known as IMT-2000 CDMA Direct Spread (CDMA DS). In W-CDMA the bandwidth of the radio channel is 5 MHz. The term is used in contrast to the competitive CDMA system, CDMA2000 and its predecessor cdmaOne, which make use of radio channels of 1.25 MHz width.
The main characteristics of W-CDMA are: